Punching machine



v l ,EASQZO L. A. M. CORSET 1 PUNCHING MACHINE Filed Aug. 2e', 1921 5 sheets-sheet l Fig. i

.Fume 19, i923.

f mi@ L. A. M. CORSET .june 19", 1923. QQSZ PUNCHING MACHINE Findlaw. .26, v1921 5 sheetssheet 2 Fig@ ,z/ (Qn/16 June lg, 1923.

L. A. M. CORSET PUNCHING MACHINE Filed Auz. 26 '1921 5 Sheets-Sheet 5 Fig. 3

Fig .4

June 19, i923.

L. A. M. CORSET PUNCHING MACHINE Filed Aug. 26 5 sheets-'sheet 4 Fig. 5

June w, 1923.

`l459,320 1 A. M. CORSETy PUNCHING MACHINE Filed Aug. 26 1921 5 Sheecs-Sheel'l 5 Patented .llene I9, 1923.

' UTuTao sTaTas nasen@ LUCIEN ALFRED MAURICE CORSET, F PARIS, FRANCE.'

' runcnrne MACHINE. i

Application filed August 26, 1921. Serial No. 495,664.

To all whom t may concern.'

Be it known that I, lLUoInN ALFRED MAURICE CORSET, a citizen of the French Republic, and resident of 29 Boulevard de Grenelle, Paris, France, have invented certain new and useful Improvements in Punching Machines, for which I have filed applications in France August 28th, 1920, and May th, 1921, of which the following 10 is-a specification.

Machines for cutting'sheets of metal by successive punching require for the convenient Aoperation of the machines the provision of a device adapted to limit the adl Vance of the sheet after each cutting operation by the punch. The methods generally employed for this purpose are of two cateories: A claw punch, said claw punch servmg to limit the advance ofthe sheet; a'punch traversed by a central pin for the same purpose.

These two systems present disadvantages. With the former, the sheet if it is desired to cut out an interior portion must be completely rotated on itself, which requires a groove of considerablede th.v With the second the pin is very ragile and easily broken.

The present invention has for its subject a machine which obviates all these disadvantages. It is essentially characterized by the fact that the limitation o f the advance of the sheet is obtained by means ofv a pin traversing the die and coming to rest upon the base of the punch. In this manner an excessive depth of groove is obviated and a special adjustable mounting of the die carrier permits the ready mounting of thev die and carrier and the accurate centering. of the 40 die with respect to the pin.

In the accompanying drawings are shown diagrammatically by way of example various forms of construction according' to the invention 4,5 In the form of construction shown in section in Figure 1 and in front elevation in- Figure 2, the machine is principally constructed for the purpose of cutting thin sheets and may be mounted upon the framework of a drilling machine of usual type. n Figures 3 and 4 show a modification in section and plan respectively.

4 for this purpose y Figures 5 and 6 show two further modi fication's of the pin operating7 means shownV inFigs. 3 and ll; i

Figure 7 shows another form of'construction having the general shape of a punching machine. The machines shown in Figs.

3 to 7 inclusive areprincipally constructed for the purpose of cutting thick plates.

Figs. 8 to 12 inclusive show the various operative positions of the punch and die in the modifications shown in Figs. 37t0 7 inclusive.

Ihe machine shown in Figure V1 comprises I V (1) A framework 1 having the general l shape of the framework of a punching machine.

(2) A vertical shaft 6 supported in the framework 1 by a sleeve screwed into the framework and in which the shaft 6 can rotate with slight friction.-

(3) A bearing 7. (4) A cylindrical slide 2 for supporting the punch in which the bearing 7 is mounted.

' (5) A punch 3- adjusted to theggiiameter of the die 4. y

(6) A die 4. (7) pA die carrier 5 adjusted by a spherical casing in the lowerpart lof the framework 1.

(8) A pin '10 continually held in contact with the punch 3Vby means of a spring 12 which rests against the in carrier 11.

As described above, t e whole device can be mounted on thefframework of' a drilling machine shown in dotted lines, the up-A er arm being shown at 23 and the supporting plate at 18.

vn order to mount the device on the machine, thetube 17 is unscrewed from the lframework 1 and the punching machine is mounted on the framework of the drilling machine-by adjusting the end of the shaft 6 in the member 22` of the drilling machine and the pin 28 is engaged in a hole provided in the support 18.

. The tube 17. is then slid into the hole of the support 18 and i's screwed into the framework y1.

Forl connecting up the driving mechanism of the drilling machine the shaft 6 and the flywheel 9 which is secured thereto, are 'ro -tated and communicate to the punch 3 a toand-fro movement by means of' the following mechanism:

The lower part of shaft 6 is provided. with an enlarged head having its upper' face engaging with the lower end of a flanged :bushing 8 screwed into theV framework, a steel washer 21 being interposed between the upper face of the enlarged head and ythe bushing to reduce the friction.

'llhe lower face of the shaft 6 is formed by two helicoidal surfaces, one of which 1n- `cludes between its sides an angle of about four-fifths of the circumference. The other, whose pitch is much greater than that of the first, includes between its two extremities one-fifth of the circumference.

The development of the corresponding helices may thus be represented by a line rising slowly during four-fifths of its course and then rapidly descending to the same extent during one-fifth of the remainder of its course. l

rllhe member 7 is provided with correspondingly inclined surfaces but it is held stationary in the sleeve 2 by a pin'.

The .tool-carrying sleeve 2 `is provided with a key seen from the front in the drawing, which prevents turning movement relatively to the -framework 1. On the rotation of the shaft 6 the inclined surfaces at the lower end of the shaft 6 and on the member 7 are caused to run on one another during four-fifths of a revolution and as the shaft 6 is revented from vertical movement the memh) afforded by the pin 1() under the actionr of the spring 12. p

When the short and rapid inclined surfaces vcome into operation a reversed movement takes place and the sleeve 2 rises rapidly 'by reason of the pin l10 which pushes the tool 3 upwards, l I

This to-and-fro movement is produced by each revolution of the shaft 6.

The plate or sheet to be cut, provided with or without a template, is moved in any desired direction against the punch in movement. When the punch 3 is in its raisedpostion the sheet passes underneath and comes to rest against the pin 10. rlhe punch descending can only engage and cut the edge of the sheet. The burr of the cut sheet is thus e'ected in the form of a segment of a circle.

er 7.,.the sleeve 2 and the tool, 3 are. forced downwards in spite ofthe reslstance Langeac 2 by any known method which does not require explanation here. As regards the die- 4r, .it is held firmly in the die carrier 5 permitting of effecting accurate adjustment of the die relatively tothe punch 3. Forthis 7@ purpose the die carrier rests on the lower part of the framework by means of a spherical knee joint which permits a slight oscillatory movement, and three screws (only one of which, 20, is shown in the drawings) arey 7@ for the purpose of obtaining and securing the die in the required position.

According to the thickness of thesheet to be cutv and the length of the punch 3, it is necessary to regulate the `height of move- Q@ ment of the sleeve. This result may be obtained by means of the sleeve 8;v this sleeve being screwed into the framework 1, thus causing the shaft 6 to `be depressed andl consequently valso the tool holder 2; when it is Screws 30 (Figure 2) screw into the face of the framework and lock the sleeve 8 vin the required position. As regards the bolt 35 unscrewed the reversed operation is obtained. y

which presses the lugs of the framework 1 @n 4against the other face thereof, this serves to take up the wear of the tool holder and its casing.` v

The guide 24 is for the purpose of facilitating the separation of the punch from the sheetduring its upward movement; it is adjusted upwardly by a milled screw 26 and is.

. supported by a spring 25; a set screw isprovided for locking the screw 26. 1-

In the case where the cutting is to-be m0 effected along a closed circle in the interior of the surface of the sheetxit is necessary to pass this sheet between the punch 3 and the pin 10, then to effect the punching operation to produce the forward hole for 1 starting.

It is then necessary to separate the punch from the pin so as to be able to pass the sheet and then to raise it still further so ,as tio disengage' the circular burr .from the In order to permit of this separatiomitheupper end of the sping 12 is attached and- When the pin 10 is to be lowered for eiiect-l 120 ing the operation above described it is suicient to turn the handle 15 towards the right and 'to cause the projection 13 to slidto the lower end of the groove 16.

carries with it the pin carrier 11' and the pin 10 is completely/disengaged from the hole in' the die, which thus permits the passage of the sheet and its being punched. In the case y During this f movement the spring 12 is depressed and l where the transmission is not suicient to 15 rasaaeo to continue the cutting, as hereinbefore described.

The pin being sufiiciently free to rest at any point of the internal circumference of the movement of the die, it will be seen that the sheet may be Ypushed in any direction and that it is not necessary to effect a complete rotation of the sheet, but simply a succession vof translations in order to cut along an internal closed circuit. It is thus possible with auniform depth of groove to eEect the cutting of sheets of greaterl size than with machines provided with a claw tool, wherein the sheet must carry out a complete revolution in order to be cut along an internal closed circle.- l rlfhe simple form of the punch which renders it less fragile when tempered, alsopermits the employment of harder steel, the formation of a better edge, and this in a more economical manner. This permits moreover of guiding the punch more easily.

Finally, the punch works very freely on the whole of its periphery and not onlyon one-half of its periphery, as is the case with claw punches wherein a part even ofthis half breaks away rather than cuts. These arethe advantages which are obtained by the employment of the pin 10.

A s will be seen hereinaftenthese advantages are still further increased when cutting thick plates.

A modification of the machine is illustrated in Figures 3 and 4. This, machine differs from the machine hereinbefore described in that certain details thereof render the operation more easy and permit of the machine being used not only for cutting thin sheets but also for cutting thicker sheets. ln' this modification (a) The device for edecting the raising 0f the punch after the punching operation is modified. It is eected by a cam instead of by means of a spring.

Details of this device are shown in Figure 3. The bearing 7 is placed at the upper end of the tool holder 2 and carries` as described -in the machine above, helicoidal surfaces which come into contact with inclined surfaces formed at the base 16 of the shaft 6.

Below this base 16 is provided a cam 15 connected to the shaft 6 also formed ewith a helicoidal surface suitably arranged relatively to the first helicoidal surface and engaging with a pin 14of the key 12. 'This key is immovably connected to the toolholder 2 by a rojection 13 and the pin 14. The action of t e cam 15 on the pin 14therefore produces an upward movement of the punch.

(b) 'llo the sleeve 8 adapted to control the height of the punch 3 is secured an adjustable wheel 17 which, wheny turned in one direction or the other, causes the sleeve 8 to rise or fall by means of a steep pitched,

thread on the -sleeve and a corresponding thread in the framework or in a nut provided thereon in such a manner that a slight movement of the wheel produces a large movement of the punch.

The wh'eel 17 may also form a movable nut and the screw thread may be formed on a member 16 secured to the framework,

this construction being shown in Figure 3.

(e) The locking of the sleeve 8 in its adjusting position is e'ected by means of a pin 20 engaging with one of a number of vertical holes 19 formed inthe wheel 17 g this-pin engaging against a spring member 22 secured to the framework 46.

For raising the punch through a consid-1,

erable distance it Vthus suffices to turn the wheel 17 through less than 360 without removing the pin 2 50. i

The pin 20 may be replaced by a handle. (d) The adjustment of the die carrier is ed'ected by a vertical screw such as 18 acting upon a Hange secured to the spherical member 5 which construction'is preferred to that shown in Fig. 1 as the screw 1 8 will be instinctively turned in the proper direction to secure the desired adjustment.

(e) Finally, the pin 10instead of resting constantly against the punch 2 under the action of a spring is separately controlled and is withdrawn from the punch at the moment when the cutting of the iron ring begins. [This device facilitates the dropping of this ring and consequently prevents the engagement of the die carrierand the pin withthe said ring; l

For this purpose there is provided for example around the base of the shaft 6 an eccentric 51 of which the collar 50 is connected by a rod 49 and the member 113 to a bell crank lever 44. 47, hinged at 45 to the framework 46. The arm 44 is lprovided with a forked end which engages with two longitudinal grooves of the sleeve 39 carrying the'pn carrier 11 and to which they are connected by a dashpot 40.

rllwo modifications of this device are shown in Figures 5 and 6. In these modifications the movement ofthe pin carrier is controlled by the rotation of a cam with.

helicoidal surfaces secured to the shaft 6 and transmitted thereto either by Ya curved lever 55 oscillating on the pivot 56 (Figure 5)., or by the member 55 of which the vertical movement is' produced by the slider 57 v(Figure 6).

In the machine according to the second form of construction, provision has been made for cutting thick sheets. This machine is stronger than the first machine and is provided with independent mechanism for controlling the pin carrier and, as has been ed upo-n the shaft of the machine and transmits an oscillatory movement by means of the bell crank lever arms 47-49, pivoted at' 48 to the bell crank lever 44 pivoted at 45, the arm 47 being slidable in a socket in the upper end of lever 44.

The lever 44 is provided at its end with a D 41 to which it is hinged by means of pins. Through this D passes a sleeve 39 secured thereto by va dashpot 40 rest-ing upon the edge 54 of the said sleeve. lnto thissleeve is screwed the pin carrier 38. rl`h`e upward movement of the dashpot is limited by a nut 42.

rllhe apparatus is regulated in such a manner that the vertical movement of the pin 36 is at least double or treble that of the punch and the pin andthe punch only v come into contact with one another when both are at the upward end of their movement.

'llhe operation of the machineis as'follows z--The sheet is advanced under the punch 35 and comes to rest against the in 36, and the cutting is effected as descri ed in connection with the previous machines, but it may here be remarked that for' thick sheets the cut-oli portion presses the pin 3G against the inner wall oi the die almost preventing any upward movement thereof, so that a very strong spring must lie-employed having a detrimentalv action.,

According to the device now described, the

' pin is rapidly disengaged as soon as it has limited the advance 'of the sheet and the punch has commenced the punching operation so that theI disadvantage disappears. At the end of the downward movement (Figure 12) it will be seen that the pin has moved through a distance about three times that of the punch and has moved laterally suficiently to allow the disengagement of the piece' cut from the sheet.

Figures 8?9, 10, 11' and 12 show various phases of the operation.

rll`he truncated cone indicated at the end of the pin has for its object to prevent.l the slight wedging which may be produced at the beginning of the cuttin ot the sheet.

To compensate for the p ay due to wear the collar of the eccentric 50, as also the member 48, can be tightened up. I

For adjusting the pin 36 according to the raaaaeo length and path. of the tool 35, the pin carrier 38 is screwed into a sleeve 39 until the end of the pin 36vis in contact with the end` of the punch 35 which has been moved to thetop of its path'.

'llhe lock nut 43 1s then tightened and this prevents the pin carrier 38 from turning in the sleeve 39. y v

'llhe dashpot 40 serves to prevent the rup-v ture of the pin in the oaseof an obstruction ya in the hole of the die, preventing the pin trom rising.` lin this case the lever 44 con'- tinues the upward movement compressing the dashpot. v a

The advantages enumerated for the first at that of tubular or concentr1c punching maas chines, which for thisreason can only'be used with diculty for cutting thick sheets.

By reason of the arrangement of the pin it may have a much larger diameter for the same advance than in the case of a concena@ tric machine and consequently it can more e'ectively resist shocks which it receives -from the sheet at each advancing movementl of the latter.

Finally, in ,consequence of the separate a5 controlling system ofthe pin it is not sub? jected to theconsiderable lateral e'orts due to the wedgmg of the cut ring during the punching operation.

Having thus described invention l0@ what ll claim as new and desire to secure by Letters Patent is t 1. A machine for cutting metal'plates by successive .punching operations, comprising in combination a cylindrical punch, a die ar- 10e ranged opposite the punch, a pin passing through the opening in `the die and adapted to come into contact with the punch during the whole movement or a portion of the movement of the punch, said pin limiting 11o the advance of the sheet during each'movement of the punch.

2. The combination with a drilling machine, of a punch, a die arranged opposite the punch, a pin passing through the opening in the die and adapted to come into contact with the punch during the whole movement or a portion of the movement of the punch, said pin limiting the advance of the sheet during each movement ci? the punch, 12o

and means for operating the punch andthe pin in snychronism.

3.; A machine for cutting metal plates by successive punching operations combined with a drilling machine, comprising in comi bination with the-shaft of the drilling machine, of a cylindrical punch, a die arranged opposite the punch, a pin passing through the opening in the die and adapted' to come into contact with the punch 'duringa por- E10@ tion of the movement of the punch, said pin limiting the advance of the sheet during each movement of the punch, means for driving said shaft, means for converting the rotary movement of the shaft into a reciprocating movement of the punch, said means consisting of inclined surfaces formed on the shaft and inclined surfaces connected to t-he punch, said inclined surfaces co-operating with one another and a spring normally pressing the pin towards the punch.

'-1. A machine for cutting metal plates by successive punching operations, comprising a tool carrier, a punch carried by said tool carrier, means for preventing rotary movement of the tool carrier, means for producing a reciprocating movement of the tool carrier, a die co-operating with the punch, a pin passing through the die and co-operating with the punch and a spring normally pressing the pin into contact with the punch.

5. A machine for cutting metal plates by successive punching operations, comprising in combination a cylindrical punch, a die arranged opposite the punch, a pin passing 'through the opening in the die and adapte to come into contact with the punch during a portion of the movement of the punch, said pin limiting the advance of the sheet during each movement of the punch, and means for adjusting the position of the punch, said' means consisting of a screwed member and means ao-operating with the screwed member for raising and lowering the screwed member relatively to the machine, and a lock nut for locking the screwed v member in position.

6. A machine for cutting metal plates by successive punching operations, comprising in combination a cylindrical punch, a die arranged opposite the punch, a pin passin through the opening in the die and adapted to come into Contact with the punch durin a portion of the movement of the punch, sai pin limiting the advance of the sheet during each movement of the punch, a tool carrier for said punch, a screwed sleeve co-operating with said carrier, a handwheel for raising and lowering said sleeve and means for locking the sleeve in position.

a. A machine for cutting metal sheets by successive punching operations, comprising a punch, a shaft for operating said punch, means between the shaft and the punch for converting the rotary movement of 4the shaft into a vertical movement of the punch, a die (zo-operating with the punch, a pin passing through the die and a spring normally pressing the pin against the die, said springbeing adapted to be lowered so as to with raw the pin from the punch so as to insert.A thel sheet to be cut.

8. A machine for cutting metal sheets by successive punching operations, comprising va punch, a shaft for operating said punch, means between the shift and the punch for converting the rotary movement of the shaft into a vertical movement of the punch, a die co-operating with the punch, a pin passing through the dienand means for imparting a larger vertical movement to thel pin than to the punch, said means permitting the pin to come into contact with the punch when vthe punch is at the end of its upper movement.

9. A punching machine comprising a framework, a tool carrier mounted in said framework, a punch carried in said carrier, a shaft rotatably mounted in the framework, means for rotating said shaft, members having helicoidal surfaces disposed between the shaft and the tool carrier, said membersbeing so arranged as to convert the rotary movement of the shaft into a vertical movement of the tool carrier, a die carrier mounted in the framework, a die in said carrier, said die co-operating with the punch, a pin passing through said die and adapted to lbe brought into contact with the punch, and means for imparting a larger vertical movement tothe pin than to the punch, said means permitting the pin to come into contact with the punch when the punch is at the end of its upper movement.

l0. A punch machine comprising a framework, a tool carrier mounted in said framework, a punch carried in said carrier, a shaft rotatably/' mounted in the framework, means for rotating said shaft, members having helicoidal surfaces disposed between the shaft and the tool carrier, said members be'- ing so arranged as to convert the rotary movement of the shaft into a vertical movement of the tool carrier, a die carrier mounted in the frame work, a die in said carrier, said die co-operating with the punch, and means for adjustably mounting the die carrier in the framework so that the die may be adjusted relatively to the punch.

il. A punching machine comprising a tool carrier, a punch carried in said carrier, a shaft rotatably mounted, means for rotating said shaft, members having helicoidal surfaces disposed between the shaft and the tool carrier, said membersibeing sofarranged as to convert the rotary movement of the shaft into a vertical movement of the tool carrier,l a die carrier, a die mounted in said carrier, said die co-operating with the punch, a pin passing through said dicand adapted to be brought into contact with the punch, a pin carrier to which the pin is connected, a sleeve into which the lpin carrier is screwed, an eccentric on the shaft, and lever ymechae nism between the eccentric and the sleeve for 125 controlling said sleeve,

lLUClEN ALFRED MAURICE CORSET.

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